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|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual; taprooted; sap milky. Stem: 1--3, erect, simple or branched distally, hollow, glabrous. Leaf: basal and cauline, alternate; basal oblong to oblanceolate, pinnately lobed, +- petioled or sessile; cauline sessile, clasping; distal bract-like, entire or toothed. Inflorescence: heads liguliflorous, 1 or in cyme- or panicle-like clusters; involucre cylindric to obconic; outer phyllaries 8--14, spreading to reflexed, unequal, < 1/2 × inner; main phyllaries +- 7--20, +- equal, lance-linear, scarious-margined, acuminate, reflexed in fruit; receptacle flat to convex, minutely roughened, epaleate. Flower: 15--30; ligule white or cream, often rose-tinged, especially abaxially, readily withering. Fruit: 9--18(20) mm, +- fusiform, tan to mottled gray-brown, body tapered to beak, ribs 5; outer fruits with upward-pointing hairs, papillate, or scaly, inner fruits mostly smooth to weakly wrinkled; pappus on small disk at beak tip, of 5--21 +- persistent, +- plumose bristles.
Species In Genus: 2 species: southwestern United States, northern Mexico. Etymology: (C.S. Rafinesque, naturalist, polymath, traveled widely in Am, 1783--1840)
eFlora Treatment Author: L.D. Gottlieb
Jepson Online Interchange
Key to RafinesquiaPrevious taxon: Pyrrocoma uniflora var. uniflora
Next taxon: Rafinesquia californica
Citation for this treatment: L.D. Gottlieb 2017. Rafinesquia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=582, accessed on April 29, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on April 29, 2017.